8/10/2019 J ANIM SCI-1991-Hardt-2310-20.pdf
1/13
P F Hardt, W R Ocumpaugh and L W Greenegrazing cereal pastures fertilized with sulfur.
Forage mineral concentration, animal performance, and mineral status of heifers
1991, 69:2310-2320.J ANIM SCI
http://www.journalofanimalscience.org/content/69/6/2310the World Wide Web at:
The online version of this article, along with updated information and services, is located on
www.asas.org
by guest on November 3, 2014www.journalofanimalscience.orgDownloaded from by guest on November 3, 2014www.journalofanimalscience.orgDownloaded from
http://http//www.journalofanimalscience.org/content/69/6/2310http://http//www.journalofanimalscience.org/content/69/6/2310http://www.asas.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.asas.org/http://http//www.journalofanimalscience.org/content/69/6/23108/10/2019 J ANIM SCI-1991-Hardt-2310-20.pdf
2/13
FORAGE MINERAL CONCENTRATION, ANIMAL PERFORMANCE,
AND MINERAL STATUS OF HEIFERS GRAZING CEREAL
PASTURES FERTILIZED WITH SULFUR'
P.
F.
Hardt2,
W.
R. Ocumpaugh3 and L. W. Greene2
Texas A M University and Texas Agricultural
Experiment Station, College Station 77843
ABSTRACT
Thirty yearling Santa
Gertrudis-sired
heifers (average initial weight
238 kg)
were
continuously grazed (five heiferdpasture) on six 2-ha oat-wheat small grain pastures for
112 d to determine the effect of feailization of pastures with urea
0
s ammonium sulfate
(AS) on mineral s t a t u s and performance of heifers. Pastures were fertiiized with either
U,
at
200 kglha, or
AS,
at 438 kg/ha, to provide 92 kg
of
N/ha in November 1987 and March
1988. Ammonium sulfate provided
107
kg of S/ha. Forage samples were collected during
each month. Heifers were initially weighed following an overnight fast and at the end of
four consecutive 28-d intervals (Periods 1 to
4).
Serum and ruminal fluid were collected on
d
56
and
112.
Pastures fertilized with AS had a greater
(P e .lo)
in vitro
ry
matter
disappearance during Periods 2 and 3. Ammonium sulfate-fertilized pastures had greater P
e .05) S
concentrations from January
29
through termination of the
trial.
There were no
differences in
DG P
e 28) or gain/ha (GPH; P